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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b679774bddc9a03a6e3fcebc7e91d4f2b3ee524ecc277bea7bfda2dd596bd34' 
  AND token = 'Sg4TnH/KmxywolCNJqd9ZxBHVXP/zS37kY2dfRBW7sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}